EP0450149A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fiber optic diffusers and method for manufacture of the same
Assignee: Health Research Inc
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Filing: 1990-10-29
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Granted: —
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Expires: 2010-10-29
Abstract
Abstract The present invention relates to improvements on fiberoptic diffusers for use in PDT and methods of making the same. This invention discloses a fiberoptic cylindrical diffuser dispersing light outwardly in a cylindrical scattering pattern which includes a fiber with a jacket-stripped core tip, a thin layer of scattering medium coated on the bare core tip, and a sleeve member with a closed end enclosing the fiber tip without touching the scattering medium and fixed on the jacket of the fiber. The sleeve member may include a tapered head. The present invention also discloses a fiberoptic spherical diffuser radiating light outwardly in a spherical scattering pattern. The spherical diffuser comprises a fiber with a jacket-stripped core tip, a bushing member with open ends circumferentially surrounding the core tip and fixed on the jacket of the fiber, and a scattering medium enclosing a portion of the bushing member and the fiber core tip in a spherical form.
Inventors
- 👤 William R. Potter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 04:47
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/241; A; A61; A61B; A61B1/00; G02B5/00; G02B5/02; G02B5/0205; G02B5/0236; G02B5/0242; G02B5/0268; G02B5/0273; G02B5/0278; G02B6/0001; G02B6/0005; G02B6/0008; A61B18/00; A61B18/18; A61B18/20; A61B18/22; A61B2018/2255; A61B2018/2261
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
51 words
A fiberoptic diffuser, comprising an optical fiber with a fiber core and a jacket for delivering light energy, said optical fiber including a jacket-stripped core tip portion, a sleeve means enclosing said fiber tip portion without touching the same and fixed on the fiber jacket adjacent to said fiber tip portion.
Claim 2
Dependent Claim
20 words
A fiberoptic diffuser in accordance with claim 1, wherein said fiber core tip portion is coated with a scattering medium.
Claim 3
Dependent Claim
31 words
A fiberoptic diffuser in accordance with claims 1 or 2 having a substantially uniform light output in an outwardly cylindrical dispersing pattern with respect to the central axis of said fiber.
Claim 4
Dependent Claim
42 words
A fiberoptic diffuser in accordance with claim 3, wherein said sleeve means includes a bore size larger than the diameter of the fiber core or the diameter of said scatterer-coated core tip, and is in a cylindrical form with one end closed.
Claim 5
Dependent Claim
22 words
A fiberoptic diffuser in accordance with claim 4, wherein said sleeve means is in threaded connection with the jacket of said fiber.
Claim 6
Dependent Claim
41 words
A fiberoptic diffuser in accordance with claim 5, wherein adhesive material is added on the threads of said sleeve means at the time of installation for ensuring a water tight seal between said sleeve means and said jacket of the fiber.
Claim 7
Dependent Claim
93 words
A cylindrical fiberoptic diffuser which has substantially uniform light output in an outwardly cylindrical scattering pattern and can be used in a biological environment, comprising: an optical fiber with a jacket-stripped bare core tip for emitting light energy, a thin layer of scattering medium covering said bare core tip for scattering the light, and a sleeve means with one end closed and the other end fixed on the fiber jacket adjacent to said bare core tip for enclosing said fiber core tip without touching said scattering medium coated on said fiber core tip.
Claim 8
Dependent Claim
32 words
A cylindrical fiberoptic diffuser in accordance with claim 7, wherein said sleeve means includes a closed core-shaped head at a desired angle with respect to the central axis of said optical fiber.
Claim 9
Dependent Claim
29 words
A cylindrical fiberoptic diffuser in accordance with claim 7 or 8, wherein said sleeve means is in threaded connection with the fiber jacket adjacent to said fiber core tip.
Claim 10
Dependent Claim
43 words
A cylindrical fiberoptic diffuser in accordance with claim 9, wherein adhesive material is added on the threads of said sleeve means or on the threads of the fiber jacket at the time of installation for ensuring a water-tight seal and strengthening the connection.
Claim 11
Dependent Claim
24 words
A cylindrical fiberoptic diffuser in accordance with claim 7, wherein said scattering medium is a composition of optical adhesive material and powdered scattering material.
Claim 12
Independent Claim
120 words
A method for manufacture of a fiberoptic diffuser, comprising the steps of: removing the cladding and sheathing of an optical fiber at one end for a predetermined length for providing a bare core tip, polishing said exposed bare core tip for providing a clean and smooth surface, choosing a colorless and transparent material to the light at a predetermined wavelength and making a desired shape thereby with a longitudinal size longer than the length of said bare core tip, boring said shaped material with one end closed for providing a sleeve means, inserting said bare core tip into said sleeve means, and fixing the open end of said sleeve means on the fiber jacket adjacent to said bare core tip.
Claim 13
Dependent Claim
46 words
A method in accordance with claim 12, further including a step of optically homogeneously coating a thin layer of light scattering medium on said polished bare core tip with the outer diameter of the coated fiber tip smaller than the inner diameter of said sleeve means.
Claim 14
Dependent Claim
31 words
A method in accordance with claim 12 or 13, further includes a step of tapering the closed end of said sleeve means at a predetermined angle for providing a sharpened head.
Claim 15
Dependent Claim
69 words
A method in accordance with claim 12, wherein said fixing step includes the substeps of: (i) tapping threads on the inner surface of said sleeve means and making threads on the surface of the jacket of said fiber in the portion adjacent to said bare core tip, and (ii) adding adhesive material on said threads at the time of installation for providing a water-tight seal and strengthening the connection.
Claim 16
Dependent Claim
71 words
A spherical fiberoptic diffuser for dispersing light in a spherical scattering pattern, comprising: an optical fiber with a jacket-stripped bare core tip at one end, a cylindrical busing means circumferentially surrounding said bare core tip without touching it, and fixed on the fiber jacket adjacent to said bare core tip portion, and a scattering medium enclosing a portion of said bushing means and said bare core tip in a spherical form.
Claim 17
Dependent Claim
21 words
A spherical fiberoptic diffuser in accordance with claim 16, wherein said bushing means is in threaded connection with the fiber jacket.
Claim 18
Dependent Claim
26 words
A spherical fiberoptic diffuser in accordance with claim 16, wherein said scattering medium is a mixture of an optical adhesive material and the powdered scattering material.
Claim 19
Dependent Claim
23 words
A spherical fiberoptic diffuser in accordance with claim 18, wherein said scattering medium preferably consists of 5% to 20% scattering material by weight.
Claim 20
Independent Claim
98 words
A method for manufacturing a spherical fiberoptic diffuser radiating light in a spherical scattering pattern, comprising the steps of: removing the clading and sheathing of an optical fiber at one end for a predetermined length for providing a bare core tip, polishing said core tip for providing a clean and smooth surface, preparing a silicon rubber mold including a round container portion and a cylindrical neck container portion, slowly filling said mold with a scattering mixture, inserting said fiber tip portion into said mold filled with said scattering mixture, and curing said scattering mixture at a predetermined temperature.
Claim 21
Dependent Claim
34 words
A method in accordance with claim 20, further including a step of fixing a cylindrical bushing means onto the jacket of said fiber before said inserting step which circumferentially surrounds said bare core tip.
Claim 22
Dependent Claim
57 words
A method in accordance with claim 20, further including a pre-pour step of preparing the scattering mixture by the substeps of: (i) mixing the adhesive material with the powdered scattering material for a predetermined time, (ii) letting the mixture stand for a predetermined time, and (iii) degasing said mixture with a vacuum pump for a predetermined time.
Claim 23
Dependent Claim
41 words
A method in accordance with claim 20 or 21, further including a step of adjusting the position of said fiber tip end in said filled mold or a step of adjusting the position of said fiber tip in said bushing means.
Claim 24
Dependent Claim
66 words
A composition which is used as a light scattering medium in a fiberoptic diffuser and coated on a bare core tip of an optical fiber, consists of an optical adhesive material with a refractive index matching the fiber core and a powdered scattering material with a different refractive index from said adhesive material, said scattering material ranging between 5% and 20% by weight in said composition.
Claim 25
Dependent Claim
30 words
A composition in accordance with claim 24, wherein said powdered scattering material is selected from the group consisting of sapphire powder (aluminum oxide) or diamond dust or zirconium oxide dust.
Claim 26
Dependent Claim
28 words
A composition in accordance with claim 24 or 25, wherein said powdered scattering material is preferably in the range of 5% to 15% by weight in said composition.
Claim 27
Dependent Claim
14 words
A composition in accordance with claim 26, wherein said adhesive material is an epoxy.
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